Points for digging buckets



Sept. 25, 1962 'F. B. EDWARDS 3,055,128

POINTS FOR DIGGING BUCKETS Filed April 13, 1959 FLOYD B EDWARDS BY WW4ATTORNEY 3,055,128 POINTS FOR DIGGING BUCKETS Floyd B. Edwards, R0. Box199, Salisbury, N.C. Filed Apr. 13, 1959, Ser. No. 805,798 Claims. (Cl.37-142) This invention relates to buckets of power shovels and moreespecially to removable and replaceable points or teeth for suchbuckets.

Buckets of power shovels, back hoes, and the like are conventionallyprovided with a plurality of pick-like teeth or points that are more orless sharp so as to enter as easily as possible into, and loosen, theearth so the bucket may be filled by forward movement into the earth.The teeth used on such buckets are conventionally solid forgings, ofconsiderable mass, to give strength to their picklike shape. Suchpick-like teeth, while having certain earth penetrating ability, possesslittle break-out action, and they are expensive to make and to maintain.

It has been found that teeth or points made in accordance with thepresent invention have great strength compared to their weight, are lessexpensive to make, and to maintain, and have greater break-out actionthan conventional teeth or points.

It is, therefore, a primary object of the present invention to provide anovel tooth or point for the buckets of power shovels or back hoes andthe like that is more ef- =fective in penetration and break-out actionthan previous points.

It is a further object to provide points that are inexpensive to makeand easy to install and to replace, and that stay effectively sharp evenas they wear.

Other and further objects and advantages will appear from the followingspecification taken with the accom panying drawing in which likecharacters of reference designate like parts in the several views and inwhich:

FIG. 1 is a perspective view of a tooth or point exemplifying thepresent invention;

FIG. 2 is a section taken at 2-2 of FIG. 1;

FIG. 3 is a side elevation of such a tooth or point mounted on a bucket;

FIG. 4 is a side elevation similar to FIG. 3 illustrating amodification.

The point of the present invention is made of an anglebar shaped pieceof metal. A body portion of angle bar provides wings 1 and 2 cut back atan angle of preferably about 35 to provide long slanting leading edges 3and 4 leaving a sharp point at '5. The edges 3, 4, 5, of course, is theearth penetrating edge of the point and it will be noted that thesurface 3, 4, S is a plane so that the outer edges of surfaces 3 and 4are sharp.

Extending forward from the rearward or trailing edge of the point arealigned slots 6, 7 leaving a rearwardly extending V-shaped portion 8 tounderlie and bear against the outer lower surface of bucket 9. The upperor wing portions and 11, bounding slots 6 and 7, respectively, will, inuse, tend to clamp bucket 9 against portion 8, and will be supported bythe upper surface of bucket 9 to prevent flattening out of the angle.

A single bolt hole 12 is in FIGS. 1, 2 and 3 shown as being provided inthe portion 8 to align with a corresponding hole in bucket 9 to receivea bolt 13 held fast by a nut 14. Other securing means than a bolt andnut may be used, such as a rivet. For extraordinarily heavy duty theends of wing portions 10 and 11 may be somewhat extended and twisted toeach present a portion lying flat on bucket 9 as indicated at 10. Theseportions may then each be bolted down as seen at 13' in FIG. 4.

It will be noted that the angle portion between parts 1 and 2, extendingrearwardly as portion 8 forms a very strong spine for the tooth. Theraked back edges 3 and 3,955,128 Patented Sept. 25, 1962 4 aresubstantially sharp even after considerable hard usage.

The point of the present invention may be made of hard steel or alloysteel and may be formed, prior to heat treatment, by rolling, forging,or any other manufacturing process. The thickness of the arms 1, 2 ofthe .angle may be of any suitable thickness which will, of course,depend on the particular service to which the points are to be put.Lighter weight teeth, that is, teeth having relatively thin arms orwings 1, 2 will be particularly suitable for digging in soil that isfull of roots and free of rock.

The angle between wings 1, 2 is preferably degrees. Other angles,however, may be selected, a wider angle giving a sharper edge at 3 and 4at the same rake angle of edges 3 and 4 with respect to the length ofthe point, and less vertical strength, while a narrower or sharper Vwill give greater vertical strength and a somewhat blunter edge along 3and 4. The angle of rake of surface 3, 4, 5, with respect to the bottomedge 5' of the tooth or point, is preferably approximately 35, thus itis seen that the point 5 and the edges of 3 and 4 are quite sharp but,at the same time, are backed up by the mass of the tooth, and are easilyresharpened, when rounded by wear, since, as pointed out above, thesurface 3, 4, 5 is a plane.

I claim:

1. In combination a digging bucket having a forward digging edge to beforced into material to be dug, and a digging tooth, said digging toothcomprising an elongated tooth body V-shaped in transverse sectioncomposed of two wing portions merging at one edge to form said V-shapedbody, said body being shaped to provide a forward sharpened end and arearward notched end, the notch in said rearward end being shaped toembrace the forward digging edge of the digging bucket.

2. The combination of claim 1 in which the angle between the wings ofthe V is substantially 90 degrees and in which the forward sharpened endis formed by a plane surface lying at an angle of approximately 35 tothe axis of the tooth.

3. In combination a digging bucket having a forward digging edge to beforced into material to be dug and a plurality of combined penetratingand scooping teeth mounted in side by side relation on said forward edgeof said bucket, said teeth each comprising an elongated body portion ofsubstantially V-shape in cross section and having leading and trailingedges and with the apex of the V-shaped body portion defining the bottomsurface of the tooth, the sides of the body portion being inclinedupwardly and cut back rearwardly from the apex of the V-shaped bodyportion to provide said leading edges, and aligned slots in saidtrailing edges extending forwardly toward said leading edge andembracing the forward edge of the digging body.

4. In combination a digging bucket having a forward digging edge to beforced into material to be dug and a plurality of combined penetratingand scooping teeth mounted in side by side relation on said forward edgeof said bucket, said teeth each comprising an elongated body portion ofsubstantially V-shape cross section and having leading and trailingedges and with the apex of the V-shaped body portion defining the bottomsurface of the tooth, the sides of the body portion being inclinedupwardly and cut back rearwardly from the apex of the V-shaped bodyportion to provide said leading edges, and aligned slots in saidtrailing edges extending forwardly toward said leading edge and shapedto accurately conform to and embrace the surfaces of sand digging bodywhereby deformation of said tooth increasing the angle of said V-shapeof said tooth provides clamping stresses between said tooth and saiddigging body.

5. The device of claim l;-

rearward notched end of the tooth embracing the forward 709,147 FaySept. 16, 1902 digging edge of the bucket remote from the apex of said800,637 Gallimore' Oct. 3, 1905 V-shaped body are twisted to be in closeengagement With 1,154,357 West Sept. 21, 1915 the upper surface of saiddigging edge, and securing means are provided to secure said portions tosaid digging 5 FOREIGN PA-TENTS bucket r 343,202 Great Britain Feb. 19,1931 References Cited in the file of this patent 332,349 Germany 9UNITED STATES PATENTS 83, 656 Patterson Nov. 3, 1868 10

